D(M)FT increment (prevented fraction) ‐ nearest to 3 years (53 trials)
Study	Prevented fraction	95% c.i.
Abrams 1980	15%	(4% to 26%)
Andlaw 1975	18%	(10% to 26%)
Blinkhorn 1983	30%	(18% to 43%)
Brudevold 1966	22%	(13% to 31%)
Buhe 1984	17%	(11% to 23%)
Cahen 1982	15%	(9% to 20%)
Di Maggio 1980	51%	(45% to 56%)
Fogels 1979	12%	(2% to 21%)
Gish 1966	14%	(‐1% to 29%)
Glass 1978	25%	(11% to 40%)
Glass 1983	28%	(16% to 39%)
Hanachowicz 1984	26%	(19% to 33%)
Hargreaves 1973	17%	(‐3% to 38%)
Hargreaves 1973a	29%	(14% to 4%)
Hargreaves 1973b	11%	(‐4% to 26%)
Held 1968	93%	(85% to 101%)
Held 1968a	40%	(‐4% to 83%)
Held 1968b	59%	(10% to 109%)
Hodge 1980	22%	(14% to 30%)
Horowitz 1966	17%	(6% to 27%)
Howat 1978	27%	(17% to 37%)
Jackson 1967	10%	(3% to 18%)
James 1967	11%	(‐2% to 24%)
Kleber 1996	‐2%	(‐50% to 47%)
Koch 1967	35%	(24% to 46%)
Koch 1967a	30%	(17% to 43%)
Koch 1967b	30%	(‐3% to 63%)
Koch 1967c	5%	(‐14% to 24%)
Lind 1974	31%	(23% to 38%)
Marthaler 1965	33%	(20% to 45%)
Marthaler 1965a	16%	(‐5% to 37%)
Marthaler 1974	33%	(15% to 52%)
Mergele 1968	6%	(‐5% to 18%)
Muhler 1955	34%	(11% to 57%)
Muhler 1970	32%	(16% to 49%)
Naylor 1967	8%	(1% to 15%)
Naylor 1979	20%	(12% to 27%)
Peterson 1967	14%	(5% to 23%)
Peterson 1979	10%	(‐7% to 26%)
Reed 1973	18%	(8% to 28%)
Reed 1975	26%	(10% to 41%)
Ringelberg 1979	15%	(1% to 30%)
Rule 1984	24%	(14% to 34%)
Slack 1967	‐2%	(‐14% to 11%)
Slack 1967a	4%	(‐7% to 14%)
Thomas 1966	31%	(15% to 47%)
Weisenstein 1972	15%	(1% to 28%)
Zacherl 1970	35%	(24% to 47%)
Zacherl 1970a	37%	(29% to 46%)
Zacherl 1972	20%	(6% to 34%)
Zacherl 1972a	21%	(8% to 33%)
Zacherl 1973	35%	(18% to 53%)
Zacherl 1981	31%	(20% to 42%)